This synchronisation effect is indeed not unique to the conceptual model: The
output of the coupled model CLIMBER-2 shows a similar pattern (with
possible waiting times between successive DO events of e.g. about 1500-5000 years
or about 1000-3000 years, depending on the noise level; compare Fig. 4a-d in
the publication of [1]}). This similarity is of course not
surprising, since the conceptual model is apparently able to mimic the
events in the EMIC and since an overshooting in the stability of both states clearly also
exists in CLIMBER-2 (compare Sect. 3.3). We note that in the GISP2 ice core data, DO
events in the time interval 27000-45000 years before present (which, as
discussed in Sect. 3.2, is the best analogue to the “background climate
state” in our conceptional model, since the duration of the cold and warm
intervals in the data is comparable in that interval) have spacings of about
1000-3000 years (compare Fig. 1) and were reported to cluster around values of
either about 1470 years or about 2940 years [2]}. Because the SR
mechanism could explain such a pattern (compare Fig. REF d) it
has originally been proposed. However, this mechanism requires a sinusoidal
input with a period of about 1470 years, which has so far not been detected.
